What Does P06AB Mean?
The PCM has detected a circuit fault with the internal temperature sensor "B" within the PCM/ECM/TCM module itself. This sensor monitors the module's internal operating temperature to protect against overheating. The fault could mean the sensor circuit is open, shorted, or providing implausible readings, which prevents the module from accurately monitoring its own temperature. Without accurate temperature data, the module cannot activate thermal protection.
Common Causes
35%
Internal PCM/ECM/TCM temperature sensor "B" failure (open or shorted element)
25%
Internal circuit board damage or solder joint failure affecting the temperature sensor traces
20%
PCM connector issue causing intermittent power or ground supply affecting internal sensor readings
10%
Software or calibration error in the module causing incorrect sensor interpretation
10%
Power supply voltage irregularity causing the internal sensor to report out-of-range values
Diagnostic Steps
1
Monitor the PCM/ECM/TCM internal temperature "B" reading via scan tool; compare it to the other internal temperature sensor ("A" if available) and to ambient temperature at cold start. A reading stuck at -40°F or 300°F indicates a failed sensor.
2
Check for any technical service bulletins (TSBs) related to this DTC for the specific vehicle make/model/year, as some modules have known sensor failures addressed by updated calibrations or replacement programs.
3
Verify stable power supply and ground to the control module; measure voltage at the module connector pins with key on. Battery voltage should be within 11.5-14.5V and ground should be below 0.1V.
4
Inspect the module connector for corroded, bent, or backed-out pins that could affect internal sensor circuit power or signal integrity.
5
If all external circuits test good, the internal temperature sensor has likely failed and the module will need replacement or refurbishment.
6
After module replacement, perform the required relearn/programming procedures per manufacturer specifications.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The PCM has detected a circuit fault with the internal temperature sensor "B" within the PCM/ECM/TCM module itself. This sensor monitors the module's internal operating temperature to protect against overheating. The fault could mean the sensor circuit is open, shorted, or providing implausible read...
The most common cause of P06AB (PCM/ECM/TCM Internal Temperature Sensor "B" Circuit) is: Internal PCM/ECM/TCM temperature sensor "B" failure (open or shorted element)
Typical repair costs for P06AB range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without a functional internal temperature sensor, the control module cannot protect itself from overheating. This means it could overheat and fail during demanding conditions (hot weather, towing, heavy city driving) without entering protective mode first. The vehicle can be driven cautiously for short distances, but extended use under load is not recommended until the fault is addressed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P06AB to identify the root cause.
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Quick Info
Category
Powertrain
System
Powertrain Control Module
Difficulty
Type
Generic (SAE)
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